ARM: tegra: Add a simple PMC driver

This PMC driver is enough to parse the nvidia,invert-interrupt property
from device tree, and configure the PMC's to honor that.

In the future, this file could expand to centralize all other PMC accesses
within the mach-tegra code.

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

diff --git a/arch/arm/mach-tegra/Makefile b/arch/arm/mach-tegra/Makefile
index 23d15fba3843109276f3c065d608d32ac0aa1e16..e0b7a4d3259996dfec3e67d226e08cfa6d62696c 100644 (file)
--- a/arch/arm/mach-tegra/Makefile
+++ b/arch/arm/mach-tegra/Makefile
@@ -7,6 +7,7 @@ obj-y                                   += clock.o
 obj-y                                   += timer.o
 obj-y                                   += pinmux.o
 obj-y                                  += fuse.o
+obj-y                                  += pmc.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)                += powergate.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)         += tegra2_clocks.o
 obj-$(CONFIG_ARCH_TEGRA_2x_SOC)                += tegra2_emc.o

diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
index 76210e5df56125ce90bd20fb8f7234335e43aece..43da4284d862c2392fb6094f77dc38a3816dc167 100644 (file)
--- a/arch/arm/mach-tegra/common.c
+++ b/arch/arm/mach-tegra/common.c
@@ -32,6 +32,7 @@
 #include "board.h"
 #include "clock.h"
 #include "fuse.h"
+#include "pmc.h"
 
 /*
  * Storage for debug-macro.S's state.
@@ -117,11 +118,13 @@ void __init tegra20_init_early(void)
        tegra2_init_clocks();
        tegra_clk_init_from_table(tegra20_clk_init_table);
        tegra_init_cache(0x331, 0x441);
+       tegra_pmc_init();
 }
 #endif
 #ifdef CONFIG_ARCH_TEGRA_3x_SOC
 void __init tegra30_init_early(void)
 {
        tegra_init_cache(0x441, 0x551);
+       tegra_pmc_init();
 }
 #endif

diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
new file mode 100644 (file)
index 0000000..7af6a54
--- /dev/null
+++ b/arch/arm/mach-tegra/pmc.c
@@ -0,0 +1,76 @@
+/*
+ * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/io.h>
+#include <linux/of.h>
+
+#include <mach/iomap.h>
+
+#define PMC_CTRL               0x0
+#define PMC_CTRL_INTR_LOW      (1 << 17)
+
+static inline u32 tegra_pmc_readl(u32 reg)
+{
+       return readl(IO_ADDRESS(TEGRA_PMC_BASE + reg));
+}
+
+static inline void tegra_pmc_writel(u32 val, u32 reg)
+{
+       writel(val, IO_ADDRESS(TEGRA_PMC_BASE + reg));
+}
+
+#ifdef CONFIG_OF
+static const struct of_device_id matches[] __initconst = {
+       { .compatible = "nvidia,tegra20-pmc" },
+       { }
+};
+#endif
+
+void __init tegra_pmc_init(void)
+{
+       /*
+        * For now, Harmony is the only board that uses the PMC, and it wants
+        * the signal inverted. Seaboard would too if it used the PMC.
+        * Hopefully by the time other boards want to use the PMC, everything
+        * will be device-tree, or they also want it inverted.
+        */
+       bool invert_interrupt = true;
+       u32 val;
+
+#ifdef CONFIG_OF
+       if (of_have_populated_dt()) {
+               struct device_node *np;
+
+               invert_interrupt = false;
+
+               np = of_find_matching_node(NULL, matches);
+               if (np) {
+                       if (of_find_property(np, "nvidia,invert-interrupt",
+                                               NULL))
+                               invert_interrupt = true;
+               }
+       }
+#endif
+
+       val = tegra_pmc_readl(PMC_CTRL);
+       if (invert_interrupt)
+               val |= PMC_CTRL_INTR_LOW;
+       else
+               val &= ~PMC_CTRL_INTR_LOW;
+       tegra_pmc_writel(val, PMC_CTRL);
+}

diff --git a/arch/arm/mach-tegra/pmc.h b/arch/arm/mach-tegra/pmc.h
new file mode 100644 (file)
index 0000000..8995ee4
--- /dev/null
+++ b/arch/arm/mach-tegra/pmc.h
@@ -0,0 +1,23 @@
+/*
+ * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+#ifndef __MACH_TEGRA_PMC_H
+#define __MACH_TEGRA_PMC_H
+
+void tegra_pmc_init(void);
+
+#endif